Stool



1.1 is a front perspective view of a stool;

1.2 is a top view thereof;

1.3 is a front view thereof;

1.4 is a side view thereof;

1.5 is a bottom view thereof;

1.6 is a side view thereof, shown stacked; and,

1.7 is an alternate perspective view thereof.

In the drawings, the broken lines showing additional stools illustrate the environment in which the stool is used and forms no part of the claimed design. 

CLAIM The ornamental design for stool, as shown and described. 